Saturday
September 20, 2014

Homework Help: mathematics

Posted by joshua on Sunday, December 30, 2012 at 4:47pm.

1. If $ is defined for all positive numbers x and y by x$y = 3x + 8y - y^3, then 10$2 =
A. 38
B. 102
C. 14
D. 20

2. If & is defined for all positive numbers w and z by w & z = 15wz - 10w + 2 then 3 & 4 =
A. 67
B. 77
C. 142
D. 152

3. All of the following are in the domain of f(x) = 5/ x + 2 except:
A. 5
B. -5
C. 2
D. -2

could you explain to me how to get the answer for them

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